川西坳陷新场气田须家河组五段烃源岩分子地球化学特征

吴小奇; 陈迎宾; 刘全有; 王萍; 曾华盛; 王彦青; 胡烨; 黎华继

doi:10.3799/dqkx.2018.236

川西坳陷新场气田须家河组五段烃源岩分子地球化学特征

doi: 10.3799/dqkx.2018.236

吴小奇^1,2,,
陈迎宾^1,2,
刘全有^3, ,,
王萍²,
曾华盛²,
王彦青^1,2,
胡烨²,
黎华继⁴

1.
中国石化石油勘探开发研究院四川地区勘探开发研究中心, 四川成都 610041
2.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
3.
中国石化石油勘探开发研究院, 北京 100083
4.
中国石化西南油气分公司勘探开发研究院, 四川成都 610041

基金项目:

国家自然科学基金项目 41625009

国家科技重大专项 2016ZX05002-006

中国科学院A类战略性先导科技专项 XDA14010402

国家自然科学基金项目 U1663201

国家自然科学基金项目 41872122

详细信息

作者简介:
吴小奇(1982-), 男, 高级工程师, 博士, 主要从事天然气地质与地球化学研究

通讯作者:
刘全有

中图分类号: P618.13
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- 被引次数: 0
出版历程
- 收稿日期: 2018-10-09
- 刊出日期: 2019-03-15

Molecular Geochemical Characteristics of Source Rocks in the 5th Member of Upper Triassic Xujiahe Formation, Xinchang Gas Field, West Sichuan Depression

Wu Xiaoqi^{1,2
,},
Chen Yingbin^1,2,
Liu Quanyou^{3
, ,},
Wang Ping²,
Zeng Huasheng²,
Wang Yanqing^1,2,
Hu Ye²,
Li Huaji⁴

1.
Research Center of Exploration and Development in Sichuan Basin, SINOPEC Petroleum Exploration and Production Research Institute, Chengdu 610041, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC Petroleum Exploration and Production Research Institute, Wuxi 214126, China
3.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China
4.
Exploration and Development Research Institute, SINOPEC Southwest Branch Company, Chengdu 610041, China

摘要

摘要: 上三叠统须家河组五段是川西坳陷新场气田勘探的热点层系之一.对新场须五段泥质烃源岩进行了分子地球化学分析，结果表明：新场须五段泥岩可溶抽提物姥植比介于0.26~1.70之间，C₂₇-C₂₉规则甾烷中C₂₇和C₂₉甾烷相对含量平均值分别为31.2%和44.6%，伽马蜡烷/C₃₀藿烷比值介于0.11~0.34，MPI₁、F₁和4-/1-MDBT均与成熟度呈正相关.新场须五段泥岩有机质生源中，陆源高等植物略占优势，但低等水生生物和藻类也具有一定的贡献；泥岩主要沉积于湖泊环境，部分沉积于缺氧的盐水环境.成熟度对一些芳烃化合物指标具有明显影响，成熟度超过1.25%的煤系烃源岩样品的三芴系列和成熟度超过1.2%的样品的MDBTs/MDBFs比值不能直接用于沉积环境的判别.
- 须家河组五段 /
- 烃源岩 /
- 饱和烃 /
- 芳烃 /
- 成熟度 /
- 三芴系列 /
- 沉积环境 /
- 石油地质
Abstract: The 5th member of the Upper Triassic Xujiahe Formation (T₃x⁵) is one of the important targets for terrigenous natural gas exploration in the Xinchang gas field in the West Sichuan Depression.The molecular geochemical characteristics have been analyzed in order to further determine the sedimentary environment of the T₃x source rocks.The studies indicate that the Pr/Ph ratio of soluble extract from the T₃x⁵ mudstone in the Xinchang gas field ranges from 0.26 to 1.70, and the relative contents of C₂₇ and C₂₉ in C₂₇-C₂₉ regular steranes are 31.2% and 44.6%, respectively.The gammacerane/C₃₀ hopane ratio ranges from 0.11 to 0.34, and the MPI₁, F₁ and 4-/1-MDBT values of the T₃x⁵ mudstone are all positively correlated with thermal maturity.The organic source of the T₃x⁵ mudstone is dominated by terrigenous higher plant, and lower hydrobiont and algae have also made a certain contribution.The T₃x⁵ mudstone was mainly deposited in the lacustrine environment, with part of the samples in the anoxic saline environment.Thermal maturity can significantly affect several indexes of aromatic compounds in coal-measure source rocks, and the three fluorene series of samples with R_o>1.25% and MDBTs/MDBFs ratios of samples with R_o>1.2% can not be directly used to determine the sedimentary environment.
- 5th member of Upper Triassic Xujiahe Formation (T₃x⁵) /
- source rock /
- saturated hydrocarbon /
- aromatic hydrocarbon /
- maturity /
- three-fluorenes series /
- sedimentary environment /
- petroleum geology

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图 1 川西坳陷新场气田位置(a)及须五段顶面埋深图(b)

据吴小奇等(2016)修改

Fig. 1. Location (a) and burial depth of the T₃x⁵ top surface (b) of the Xinchang gas field in the West Sichuan Depression

下载: 全尺寸图片幻灯片

图 2 新场须五段泥质烃源岩Pr/nC₁₇和Ph/nC₁₈相关图

Fig. 2. Correlation between Pr/nC₁₇ and Ph/nC₁₈ of the T₃x⁵ argillaceous source rocks in the Xinchang gas field

下载: 全尺寸图片幻灯片

图 3 新场须五段泥质烃源岩Pr/nC₁₇、Ph/nC₁₈和Pr/Ph三角图

底图据王铁冠等(1995)

Fig. 3. Ternary diagram among Pr/nC₁₇, Ph/nC₁₈ and Pr/Ph of the T₃x⁵ argillaceous source rocks in the Xinchang gas field

下载: 全尺寸图片幻灯片

图 4 新场须五段泥岩甾烷(m/z=217)和萜烷(m/z=191)化合物分布

Fig. 4. Distribution of sterane (m/z=217) and terpane (m/z=191) compounds of the T₃x⁵ mudstone in the Xinchang gas field

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图 5 新场须五段泥质烃源岩C₂₉/C₂₇甾烷比值和成熟度关系

Fig. 5. Correlation between C₂₉/C₂₇ sterane ratio and thermal maturity of the T₃x⁵ mudstone in the Xinchang gas field

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图 6 新场须五段泥岩芳烃化合物分布

Fig. 6. Distribution of aromatic compounds of the T₃x⁵ mudstone in the Xinchang gas field

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图 7 新场须五段泥岩R_o与MPI₁(a)和F₁(b)关系

川北T₃x据Li et al.(2015)；西加盆地据Radke et al.(1982)

Fig. 7. Correlations between R_o and MPI₁ (a) and R_o and F₁ (b) of the T₃x⁵ mudstone in the Xinchang gas field

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图 8 新场须五段泥岩三芴系列相对含量分布

底图据程克明等(1995)

Fig. 8. Ternary diagram among three fluorene series of the T₃x⁵ mudstone in the Xinchang gas field

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图 9 新场须五段泥岩氧芴/硫芴(a)和芴/硫芴(b)随成熟度的变化

Fig. 9. Variations of OF/SF (a) and F/SF (b) with thermal maturity of the T₃x⁵ mudstone in the Xinchang gas field

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图 10 新场须五段泥岩DBT/P(a)和MDBTs/MDBFs(b)与Pr/Ph的关系

底图a据Hughes et al.(1995)；底图b据Radke et al.(2000)

Fig. 10. Correlations between DBT/P and Pr/Ph (a) and MDBTS/MDBFs and Pr/Ph (b) of the T₃x⁵ mudstone in the Xinchang gas field

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图 11 新场须五段泥岩MDBTs/MDBFs(a)和4-/1-MDBT(b)与R_o的关系

Fig. 11. Correlations between MDBTs/MDBFs and R_o (a) and 4-/1-MDBT and R_o (b) of the T₃x⁵ mudstone in the Xinchang gas field

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表 1 新场须五段泥岩分子地球化学参数

Table 1. Molecular geochemical parameters of the T₃x⁵ mudstone in the Xinchang gas field

井号	深度(m)	主峰碳	R_o	OEP	CPI	Pr/Ph	Ts/Tm	伽马蜡烷/ αβC₃₀藿烷	αααC₂₇ (%)	αααC₂₈ (%)	αααC₂₉ (%)	MPI₁	F₁	DBT/P	MDBTs/ MDBFs	F(%)	OF(%)	SF(%)	4-MDBT/ 1-MDBT
X503	2 788.0	C₁₈	0.91	1.01	1.13	1.22	0.97	0.11	22.0	17.7	60.3	0.726	0.525	0.08	0.21	25.5	58.2	16.4	6.27
X503	2 864.0	C₁₈	0.93	0.97	1.12	1.57	0.63	0.14	23.1	20.0	56.9	0.750	0.529	0.08	0.30	35.8	45.3	18.9	5.98
X503	2 903.0	C₂₂	1.11	0.94	1.17	0.75	0.87	0.15	28.2	21.7	50.1	0.771	0.534	0.08	0.21	32.6	52.6	14.8	6.90
X503	2 935.0	C₁₉	1.10	1.02	1.09	1.69	0.80	0.32	27.9	23.2	48.8	0.821	0.542	0.08	0.21	30.8	54.2	15.0	6.83
X503	2 968.0	C₂₂	1.07	0.91	1.16	0.41	0.98	0.19	32.0	25.6	42.3	0.887	0.534	0.07	0.65	52.1	25.5	22.4	8.79
X503	2 976.0	C₁₈, C₂₂	1.18	0.95	1.24	1.33	0.82	0.15	28.5	22.6	48.9	0.835	0.532	0.09	0.38	40.1	40.0	19.8	7.56
X503	3 189.0	C₂₂	1.23	0.91	1.12	0.48	1.01	0.16	35.3	26.2	38.5	1.033	0.586	0.09	1.40	53.3	16.7	30.0	11.52
X503	3 210.0	C₂₂	1.25	0.91	1.11	0.43	0.73	0.30	33.0	27.0	40.0	0.943	0.599	0.10	0.76	43.8	26.6	29.6	13.28
X503	3 219.0	C₂₂	1.26	0.94	1.15	1.32	1.05	0.21	33.7	25.8	40.5	1.193	0.599	0.06	2.49	45.7	13.3	41.0	11.28
XY-1	3 030.8	C₂₅	1.30	1.06	1.13	1.19	1.14	0.14	34.1	26.2	39.7	1.065	0.580	0.10	2.03	32.9	18.3	48.8	11.33
XY-1	3 058.8	C₂₅	1.32	1.04	1.11	0.26	1.05	0.14	39.7	25.6	34.7	1.036	0.585	0.07	2.64	44.2	13.0	42.8	11.80
XY-2	3 058.3	C₁₈	1.25	0.92	1.07	1.70	1.04	0.34	30.6	25.4	44.0	1.018	0.571	0.08	0.86	45.7	25.7	28.6	11.61
XY-2	3 090.0	C₁₉	1.20	1.00	1.17	0.93	0.71	0.25	32.6	26.5	40.9	0.999	0.576	0.10	2.18	36.5	16.3	47.1	10.50
XC28	3 288.0	C₂₂	1.27	0.92	1.12	0.30	0.99	0.15	35.4	26.4	38.2	1.036	0.614	0.08	2.34	53.5	11.7	34.8	14.65

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